CRIM 320 Chapter Notes - Chapter 4: Squared Deviations From The Mean, Standard Deviation, Frequency Distribution

• School: Simon Fraser University
• Department: Criminology
• Course: CRIM 320
• Professor: Jeffery Mathesuis

Document Summary

A measure of variability: r = h-l, where. L = lowest score in a distribuion: the advantage of the range its quick and easy computaion is also its most important disadvantage. Range is totally dependent on only two score values. The variance and the standard deviaion merely a crude index of the variability of a distribuion: variance = also known as the mean of the squared deviaions symbolized by s , variance = s = (x - x ) / n. N = total number of scores s = variance. (x - x ) = sum of the squared deviaions from the mean: standard deviaion (the square root of the mean of the squared deviaions from the mean of a distribuion. A measure of variability that relects the typical deviaion from the mean s= ( x x )2. (x - x ) = sum of the squared deviaions from the mean. N = the total number of scores.